Signaling system



i To all whom it 001mm;

; Patented May 22, 1923.

UNITED. sra'ras 1,456,059 PATENT OFFICE} 'nneaa'n. .ronnsou, or ms'r'oaauea, mzw was, sssmnon rowns'rnmr ELEG- rarc conmmr, mconroaa'rnn, onNEW Yoax, N. 1., A coarona'rrou or m iroax.

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Application filed January 18,1918, Serial Miami. Renewed mm as, mo.serial No. 400,731.

I I i A v Brownfi No. 1,185,472, telephony, May 13, l

' Be it known that I, EDGAR D; Johnson, a citizen of the United States,resldm at East Orange, in the county of Essex of New Jersey, havemvented 'certam new and useful Improvements in Signaling Sys-*- tems, ofwhich the following is a full, clear, concise, and exact description.

This invention relates to electrlc c rcuits wherein a repeater or thelike 1s com 1ected between two transmission line sections 1n one mannerfor transmission in one dlrectlon and in another manner for transmlsslon1n the 0p osite direction.

An 0 ject of the inventlon 1 s to efi'ect, re--' versal of the repeater00111160130118 automatically, in response to current, such as voicecurrent, impressed on the lines.

The invention in one of lts aspects provides a single repeating unitwhlch 1s normally connected between the two termmals of a telephone linefor tIaDSmlSSIOII 1n one direction, a reversing switch being provldedbetween each line section and the transmitter. A voice relay isconnected 1n ser1es to each of the lines, and the operation of either ofthe voice-operated relays serves to render the other inoperative, andchanges the connections of the repeater to the hue terminals in case itis necessary that such change be made for transmission of current in theproper direction. Upon the cessatlon of voice current in the telephonebus, the repeater remains normally connected to transmit current in onedirection throu h the telephone lines. Further objects of t e inventionwill be made apparent in the following detailed desc-riptlon taken 1nconnection with the accompanying drawmg, 1n which the single figureshows diagrammatioally a two-way repeating system WhlOh illustrates theinvention.

Referring to the drawin the repeater 1 which is here shownas o themechamca type, but any other type may be employed,

' 1s adapted to be reversibly connected between the lines 2 and 3 bymeans of the electromagnetic switches 4 and 5. The switches 4 and 5 arecontrolled by the direct current relays 6 and 7, and the latter are inturn v controlled by the voice relays 8 and 9. The

- invention is not limited to any articular form of voice-operatedrelay, an as illustratin one type of relay that may be employeci;reference is made to the patent to 1916;, responsive to alternating orpulsating current, such as voice current, to cause the vi- .brationjofthe normally closed contacts 10 and 11, respectively.

With the connections shown in the draw- "ings, the repeater is adaptedto transmit current in the direction from the line 2 to v theline 3, byway of the following circuits:

-' put side of the repeater 1 passes by way he voice-operated relays 8and 9 are of the repeatin .coil 15 through armatures 16 and 17 of swltch5, to the line 3, the voice relay 9 being short-circuited by armature 18of relay 19, by reason of the fact that the voice relay 8 has previouslyvibrated its contacts 10 to sufiicientlydeenergize switch 19, so thatthe armatureIS assumes its closed position. With current approaching therepeater 1 by. way of the line 2, the only change in the connectionsshown is the short-circuiting of the relay 9 which renders the sameinoperative. If current approaches the re eater. 1,

connected as shown, by way of t e line 3,

it is necessary that the switches 4 and 5 be operated to reverse theconnections of the repeater between the lines, so that the input side ofthe repeater is connected to the line 3, and its outputside to the line2. It is also necessary that the voice relay 8 should be renderedinoperative. These changes in the conditions of the circuit are broughtabout in the following way: When no current is coming in 'over eitherline 2 or line 3, the contacts 10 and 11 are quiet, and the relay .19and similar relay 20 are energizedi thereby attracting their armatures18 an 21, respectively, which effectively connects the relays 8 and 9 inseries in their corresponding lines. Current coming in over line 3passes through armature 16, secondary of repeating coil 15, armature 17,voice relay 9 to the line 3. The voice rela 9 be ing energized, itscontact 11 is vi rated, thereby deenergizing relay 20 and shunting therelay 8 by means of the armature 21.

The vibration of contact 11 also serves to deenergize the relay 6, andthe circuit may be traced from ground, through armature -11, armature 22of relay 7, of.

, 1,456,059 E. D. JOHNSON S IGNALING SYSTEM May 22, 1923.

original Filed Jan. 18. 1913 haven/0r. Edgar 0. Johnson mechanismtherefor and means for control-' trolled thereby, a second relaycontrolled by said contact, and means responsive to the actuation ofsaid contact to change its controlling relation with respect-to saidsecond relay; one of said first-mentioned relays being responsive tocurrent impressed on one of said lines, another thereof-being responsiveto current impressed on the other line. 8. The combination of 'two'lines, a repeater to be reversibly connected thereto and means forcontrolling therepeater connection, comprising a plurality of.thefollowing elements: an A. C. relay, a normally closed vibratilecontactcoritrolled thereby, a second relay controlled by said contact,and means responsive to the actuation of said contact to change itscontrolling relation with respect to said second relay; one of said A.C. relays bein res onsive to current'impressed on one o 'sai lines, andanother thereof bein responsive to current impressed on the ot er line.

9. The combination of twolines, a repeater to be. reversibly connectedthereto and means for controlling the repeater connection, comprising aplurality of the following elements: an A. C. relay a normally closedvibratile' contact controlled thereby, a second relay controlled by saidcontact, and means responsive to the actuation of said contact todisconnect it from the winding of said second relay; one of said A. C.relays being responsive to current impressed on one of said .lines, andanother thereof being responsive to current impressed on the other 10.The combination of two telephone lines, a repeater therefor, switchingmeans having a. bias constant in direction connected between saidrepeater and each of said lines, and an alternating current relay inseries with each of said lines and com-' 12. Two telephone lines, arepeater therefor, a: switch between each line. and said. repeater, asolenoid for each of sa1d switches, an alternating current relay inseries with each of said lines, a vibratile contact for each of saidrelays, and connections whereby both of sa1d solenoids are controlled byeach of said relays.

13. The combination of two telephone lines, a repeater therefor,switching meanshaving a bias constant in direction for reverslb lines,said switchm 14. A repeating system comprising two lines, aunidirectional repeater, reversing switching means having a/bias'constantin dlrection for connecting said repeater for two-waytransmission between saidlines,

y connecting said repeater. to said, l v means comprisinga I pluralltyof solenoi s, and an alternat ng N 7 current relay in serieswith oneofj'sai 3 "lines for controlling said solenoids said repeater beingconnected for transmission in one direction between'said lines in theabsence of current to be repeated, and means, including a voice-relay inseries with one of said lines, for controlling-the reversal of saidrepeater.

15. A repeating system comprisingt'wo lines, a unidirectional. repeater,reversing switching means for connecting said frepeater for two-waytransmission between said lines, said repeater being connected fortransmisslon in onedirection between said lmes in the absence of currentto be repeated, and means for ontrolling the reversal of said repeater,said last mentioned meansincluding voice relays one of which is inseries with one of said lines and one of which renders anotherineffective at times."

16. A repeater system comprising a line, a repeater therefor a voiceoperated relay associated the'rewit a circuit in shunt to said relay forcontrolling the operation thereof, and means responsive to currentimpressed on said line for controlling said shunt circuit.

17. A signalin system comprising a repeater, a line, an means fo'rreversibly connecting said repeater thereto, said means 7 including twosets of relatively movable contacts connected in tandem, a windingresponslve to alternating voltage on said line for operating one of saidsets, and electro-' magnetic means controlled by said one set forcontrollin said other set. A v

18. A signa ing system comprising a repeater, a line, and means forreversibly connecting said repeater thereto, said means including twosets of relatively movable contacts connected in tandem, a winding for.holding one of said sets open, a winding responsive to alternatingvoltage on said line for operatin the other of sa1d sets, and a relaycontrolle by said other set for controlling sa1d first mentionedwinding.

1 therefor, a contact controlled by said relay,

a second relay controlled by said contact, and means responsive to theactuation of said second relay to change the controlling relation ofsaid contact with respect to said second relay.

20. The combination of a line, an alternating current relay responsiveto current impressed on said ine, a normally closed -vibratile contactcontrolled by said relay, a

second relay controlled by said contact, and means responsive to theactuation of said contact to change its controlling relation withrespect to said second relay.

21. A two-way repeater system comprising a line, a repeater adapted tobe reversibly connected thereto, switching mechanism between said lineand said repeater, 0,

relay responsive to current said line for controlling said mechanism, acontact controlled by said relay, a second relay controlled ,by saidcontact, and means respon-f sive to actuation of said second relay tochange the controlling relation of said contact with respect tosaidsecond relay.

22. The combination of a line, an alternating current relay responsiveto current impressed on said line, a normally closed vibratile contactcontrolled by said relay, a second relay controlled by said contact, andmeans responsive to the actuation of said contact to disconnect it fromthe solenoid of said second relay. f

In witness whereof, I hereunto subscribe my name this 14th day ofJanuary A. D.

EDGAR D. JOHNSON.

